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-3x+(-7x)=-40
We move all terms to the left:
-3x+(-7x)-(-40)=0
We add all the numbers together, and all the variables
-3x+(-7x)+40=0
We get rid of parentheses
-3x-7x+40=0
We add all the numbers together, and all the variables
-10x+40=0
We move all terms containing x to the left, all other terms to the right
-10x=-40
x=-40/-10
x=+4
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